Business in Spain with physics lab (7)

I believe the answer is:

concern

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'business' is the definition.
(eg 'none of your concern', 'none of your business')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for concern that I've seen before include "Affair" , "Business organisation" , "Involve" , "Business - worry" , "Cause of anxiety" .)

I've seen this clue in The Times.

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